Small signal stability assessment of a DFIG based wind power systems

The global increases in electricity demand, it leads to integrate the non-conventional energy resources to the grid for the sustainable development. The presences of wind energy to the grid, it has resulted in problems related to the stability of the system, security of the system and power quality. Therefore, it has required studying the stability of the system before connecting to the grid. In this paper, small signal stability analysis has carried out on an eleven bus test system with considering a three-phase fault at one of the buses. The system consists of four machines, in which one is Doubly Fed Induction Generator (DFIG) and others are Synchronous Generator. The presence of DFIG induces oscillatory instability to the test system. To improve the stability of the network, it has excited by the excitation controller to the synchronous generator. For the stability analysis, the test system has observed by replacing the synchronous generator with DFIG at various location.